Louis



(No Model.)

M. KEARNEY & M. C. HAWLBY.

BOILBR PURNAGE.

N. PEERS. Photo-Lithograph", Wnlxingimae.

UNITED STATESv PATENT Erice.

MICHAEL KEARNEY, OF SPRINGFIELD, AND MELVILLE C. HAWLEY, OF ST. LOUIS, ASSIGNORS OF ONE-THIRD TO MARY S. ROGERS, OF ST. LOUIS,

MISSOURI.

BOlLER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 393,336, dated November Y 1888.

Application filed Juno 25, 1888. Serial No. 278.154.

To all whom it may concern:

Be it known that we, MICHAEL KEARNEY, of Springfield, Missouri, and MELvILLE C. HAWLEY,01` St. Louis, same State,have j ointly 5 made a new and useful Improvementin Steam- Boiler Furnaces, of which the following is a full, clear, and exact description.

The improvement relatesA more especially to those furnaces in which a downward draft is io employed; and it has for its objeet,rst,a more thorough consumption ofthe fuel than hitherto has been attainable in similar furnaces; second, a better circulation of the water throughout that portion of the water-space which is i 5 immediately about the furnace.

To the above ends, respectively, the improvement consists mainly in making the A grate-bars tubular and connecting them at both ends with the water-space of the boiler and at zo one end of the bar applying a vertically-arranged extension thereto, and thereby forming a tubular construction whose inlet and outlet are at different levels, and whose lower portion is exposed directly to the heat of the 2 5 furnace, all substantially as hereinafter set forth and claimed, aided by the annexed drawings, making part of this specification and exhibiting the most desirable mode of carrying out the improvement, and in which- Figure 1 is a vertical longitudinal section of a locomotiveboiler, in which all the vfeatures of the improvement are jointly embodied. The section is on the line l l of Fig. 2, and only that portion of the boiler is shown which is needed for an understanding of the improvement; Fig. 2, a transverse vertical section on the line 2 2 of Fig. 1; and Fig. 3, a detail, being a view, partly in elevation and partly in section, showing an expansion-joint of one of 4o the grate-bars.

The same letters of reference denote thesame parts.

A represents the boiler, which, saving as it may be modified by the application thereto of 4 5 the improvement, is of the usual construction. B represents the nre-place; C, the fire-place door; D, the ash-pit; E, the door to the ashpit, and F a combustion-chamber between the fire-place and the boiler-fines G, Fig. 1. The

(No model.)

course taken by the heat-currents and the pro- 5o ducts of combustion from the fire-place is indicated by the feathered arrows x, Fig. 1.

H Hf represent, respectively, the upper and the lower tier of grate-bars. They are ar ranged horizontally or substantially horizontally at the bottom of the lire-place. In a downward-draft furnace the ashes which form at the grate are an undesirable obstruction, which, by means of the present system' of grate-bars, is materially diminished. Owing 6o to the two tiers of bars arranged to bring the lower bars beneath the spaces between the upper bars the fuel is supported partly upon the bars of the upper tier and partly upon the bars of the lower tier. This causes the grate-surface to be multiplied. It also, while practically furnishing a continuous support for the fuel, provides openings between the lower bars and the upper bars, through which the ashes can drop. The fire is thus being constantly 7o and automatically cleared of its ashes While its unconsumed fuel rests upon a support beneath. The best results are obtained when the bars in each tier are spaced two inches apart or thereabout, measuring from the shell of the bar, and the level of the tops of the lower bars is about one-half of an inch below the level of the bottoms or" the upper bars. We have ascertained that this circulation is promoted by extending the tubes at one end of the grate- 8o bars upward in the water-space a of the boiler, substantially as shown at H2, Fig. 1. This promotes the movement of the Water over the crown-sheet a downward through the space a at the front of the tire-place into and through the gratebars,upward through the extensions H2, and thence over the fire-place again. This circulation is especially' valuable in connection with any downward-draft furnace,and notably one whose bars are arranged in the zigzag style 9o shown,as in such an arrangement of the gratebars they are particularly exposed to the heat, and a more rapid circulation of the water through the bars is at once desirable as a protection to the bars and as promotive of evaporation, as indicated by the unfeathered arrows y. We have evaporated in use ten and onethird pounds of water to one pound of soft coal in a boiler embodying the present improvement. rlhe grate-bars H H, in the plaee of being held firmly at the ends in the shell of the boiler, are held at one or both ends in thimbles l, Figs, 1 and 3, which in turn are screwed into or otherwise secured in the boilershell, as shown. rlhis permits the grate-bar to elongate and to shorten at will. The joint around the end of the grate-bar is made suitably water tight.

rlhe openings in the ash'pit for the introduction of the steam jet to clear the ash-pit by urging the ashes toward the ash-pit door, are shown at J, Figs. land 2. When not used for admitting the steam referred to, they can be utilized to admit air to the combustion-chamber F, for the purpose of promoting the eombustion of the gases which may form therein or come from the lire-place. l

XVe claim- 1. A boiler having a l'urnaee whose grate is composed of tubular bars arranged horizon tally and at one end thereof connecting with the water-space of the boiler at the level of the bars and at the other end being extended into the water-space of the boiler and therein eX- tended upward in a tubular form to eonneet with the waterspace of the boiler at a higher level, and by enabling the water-eireulation upward through said bar-extensions to be independent of that circulation which takes place in the water-space surrounding said bar-extensions to promote the water-circulation through said grate, substantially as described.

2. A boiler having a downward-draft furnace whose grate is composed of two tiers of tubular bars, the bars in the two tiers being relatively arranged as described, and the bars at one end thereof being connected with the water-space o1' the boiler at the level of the bars and at the other end being extended into the water-space of the boiler and therein extended upward in a tubular form to connect with the water-space of the boiler at a higher level andto enable the water-circulation upward through the said bar-extensions to beindependent of the circulation in the water-space surrounding said bar-extensions, substantiall y as described.

\Vitness our hands.

MICHAEL KEARNEY. MELVILLE C. HAVLEY.

NVitnesses to signature of Michael Kearney:

C. D. MOODY, T. J. DELANMY. W'itnesses to signature of Melville C. Hawley:

C. D. MooDY, JOHN S. Romans. 

